Improvement in locking-nuts



UNITED STATES PATENT EEICE.

cAsPEn DITTMAN, on LEAcocK, PENNSYLVANIA.

IMPRovi-:MEN'T |N LocKme-NuTs.

Specification forming part of Letters Patent No. 154,851, dated September 8, 1874; application led May 14, 1874.

To all whom it may concern: l

Beit known that I, CASPER DITTMAN, of Leacock, in the county of Lancaster and State of Pennsylvania, have invented a new and Improved Locking-Nut; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing' forming a *part of this specilication, in which- Fig.

claim.

A represents a wrought or malleable iron nut, between which and an outer higher shell, A', is formed `a chamber, B,". to receive the rubber or other elastic substance C. l rlhe latter extends considerably above the nut A, but not quite to the top-f shell A', and is, by the compressive force f a correspondingly-shaped follower or washer, D, expanded until it comes into frictional contact with the threads of bolt. This prevents the nut from turning on the bolt as the former is locked to the latter by the rubber, while the expansion and contraction of the bolt are taken up by a corresponding expansion and contraction on the part of the rubber. The washer D has recesses d, preferably inclined on the bottom, and adapted to receive4 the overlapped lips, a, which project upwardly from the edge oi' shell A. This serves the purpose of holding the parts of the device together for transportation or during the manipulations of trade, while it also locks the washer to the nut when the latteris screwed down upon a ish or other plate that is to be attached. l

I am aware that in lock-nuts rubber has been heretofore brought against the thread of a screw for the Vpurpose specified, and therefore design to coniine myself to my particular means of forcing it into contact therewith.

Having thus described my invention, what I claim as new is- A nut-lock consisting of nut a, constructed with an annular space, as described, to receive an elastic substance, o', which is compressed by a washer, D, until a portion of it comes into contact with the thread of the bolt, substantially as described.

CASPER DITTMAN.

Witnesses:

l SoLoN C. KEMON, OHAs. A. PETTIT. 

